Tire-pressure gauge



W. A. ALLEMAND C. C. ABBE.

URE PRESSURE GAUGE.

APPucmon mm m1411910. ninzwin Jun: 6.1921.

Patented Jan. 10, 1922.

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- n. somsnnns son, nrconromim. or :new Your, N. y., A conromnon ormms-reissen amen speculation ot Lewm hun Patented Jan.,10, 1922.

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To al'loom concerne Be it known that we WILLIAM A. ALLEN, in Yonkers,\'es{'.-:'heetex: County,

v State o New York and Canute C. Auen,

residingin Essex `ells, county of Essex State of 4New Jersey and bothcitizens o the'United States of merica, have .invented oeltninnew andusefulV Improvements in in -is e specification. Y

luminvention relates to the construction of pressure gnuges,'moreparticularly such as u'e inten ed, for testing air pressure in theneumatic tires of automobile wheels and the ike; Thernainobject of ourinvention is to so construct the gaugethet it will be sini le andeconomical to manufacture, not lab e to' get out of order, willYindicate the pressure accurately, be convenient to curry und handle andto ap l to the tire nipple,

4.und finally that the in ication of the prep sure may be maintainedtemporarily after removal of the .device from the tire 11i-pple.

In the accom anying drawing- Fig. l is a si e elevation nf nur mnr-ovedwith t e lower end of the outer case A. As

`a. convenient means of connecting the ends of the spring to theseparts, we provide u 4cross-pin d passing through :i transverse lcarrying n nipple opcning in the piston head b and a loop ut t ecorrespondin end of the spring, while u' pin (l1 passes tirou h u looput the other end of the spring und eers :iguinst the lower end of theruse A, Fig. 2. A fcrrule a screwed onto the lower end of the euse Alate E helps to hold the pin d1un pince. rlille nipple part e of theplate E has openings e* for the admission of air to the inner orunderside of the piston.l when on application of the device to t e tireni ple, the surroundin rubber gasket or other yielding pecking??hus'hecn pushed back und the tire valve then opened h thc nipple part ofthe plate E.

The upper end of the tubular piston L 'ui closed by a plug or head b,while the lower Vis closed by s. cap a.

.head b of a. longitudinal slot s inthe outer ease,

ngside the,v 1) are marked to .the exterior-.of the piston yend may haveanl external cupped packin b1, Fig. 8 to make a close sliding fit withithe case us langes the piston, so as to enc ose the The outer euse isnearl twicelatter in all its positions and its up r end l.he en in'eating mens, we i:prefer to form on or aix to the i e piston aprojection-p entering on the outer face of the case, alo slot,greduetions o, (Fig. indicate the air b2' the rise f the Plibpnigmt e'pull.- th' Spne, the proectlon p actinges the pointer. v

le provide means wherebyhe ressure .indications may be registered, t is,the indication of pressure maintained after-the device has been teken'off the tire nip let. Jon

In the drawings. we have shown provide B, a. series of ratchet 'teeth twith which m'ay vengege e.

I|I)11:.oje ction or finger t1 on a spring arm T.

1s sprin l long. at b ade secured' atoneemd to the outside of the cesaat y, while its free end,

curryingthe projection or finger t', lies about mide-ay of the length ofthe case. By meklng this tub'ulur case upwards of twice the length ofthe piston, so us to inclose the lutter et all times, I provide unimplement convenient to be grasped and heid in the hund in various ways,no mutter in what position it has to be a plied to the tire nipple.; Andthe free en of the spring arm being about midway ofv the length of thecese,

is in convenient position to bepreed by the linger or thumb of the user,no mutter 1n arm consists of a. moderatelyy 'what position theinstrument be held hy If this spring erm T is made to normali pressinwards.'- it will serve to lntch beiln the ratchet teeth t, es the airpressure forces the (piston upwards, and thus keeps re is.- here backugnin. Or the spring of the arm T muy be awa fr om the piston, and theuser may lgroep t e instrument in such a way that the tiumh or e'lin ermay press on the arm T and press its iger 1 .into engagement with thepiston when np lying the rInstrument to the tire nipple. It may be soheld when removed from the tire nipple and until the recorded pressurecun be examined. This is n feature4 of practical importance, for oftenthe tires have to be tested in the dark the apressure until the arm T 1spu led l or in dark places, where the graduations inheld on the tirenipple.

ur inventiodoes-not relate-to that class of gauges., *which `expansionchamber com rises. tubes' Varmged one in-extension of eV other, but-isjcqnned5 in its main features,' to a. "gengef ixryhich there is anenclosin tbeyrvlillg'g 'thin which is embrace an end" accordingly we donet claim' as our'lpvention- ,ggzpresszure gangecqmp "twofjtelesoogic'tubes formmg p ipansib, e air' chamber, en l'eivztension apringwithinsaid tubes connected to the respective tubes for'inor'mall lcontractingthe tubes, means at one-end o one tubefor cooperating' with thesirvvalve of a pneumatic tlre to d e ress the valve stem and open thevallve an vwdmit air to the interior of said tubeg` thel other tubebeing closed at its end remote'froin. saidv'alve openingA end of thecooperating tube, one of thev tubes having griduatins'for incllcatin3the amount of extension of the tubes and t e corresponding ressure.

e cliiim es our invention4 1 A portble pressure gauge f orpneumatictires comprising an elongated casing having at one end means 4to make atight jointfvvith4 a.l tire valve by opening it over the latter andhaving. means at 'such end lor'opening such valve to permitcommunication of air from the tire to the gun e' and said nge hav-.ingan indicating mem er adapted slide along said casing whenmoved by einwhile the gan is in communication' `Awith the v`lve sai Casin lengthtoextend beyon the indicating member at all positions of thelatter, andmeans operative 1n all positions of the gauge for holding saidindicating member temporerily in` its indicatingl position aftersuchvcommunication is broken whereby-the indication may be' read aftertlie gauge is removed from the tire valve, such-means comprising a.spring arm connected to `the exterior 0f the casin and adapted tovautomatically engage sai indicating memberin its varying positions.

' Invtestlmony'whereof we have signed our names to this t of twosubscribl'n' itnesses.

, 'V' l .'A. ALLEN. CHARLES C. ABBE.

Witnesses: i

being of sucient peci ation, in the presence 6o

